refactor(sheet): copy&paste

[waterhydroxyl]

1、Remove the use of getComputedStyle API and mount a large amount of text strings to the DOM. 2、Fix the memory leak issue caused by pasting external content 3、Keep the style data of each cell in the merged cell consistent when pasting, and improve the consistency of the direct copy and paste scene with Excel and Google Sheets

before change

after change

Pull Request Checklist

• [x] Related tickets or issues have been linked in the PR description (or missing issue).
• [x] Naming convention is followed (do please check it especially when you created new plugins, commands and resources).
• [x] Unit tests have been added for the changes (if applicable).
• [x] Breaking changes have been documented (or no breaking changes introduced in this PR).

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[waterhydroxyl]

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